SYNTHESIS AND CHARACTERIZATION OF A POROUS ZIRCONIUM ARSENATE, [ZR-3(ASO4)(4)(H2O)(2)]CENTER-DOT-2H(2)O

A zirconium arsenate compound with composition [Zr-3(AsO4)(4)(H2O)(2)] . 2H(2)O was synthesized by the reaction of zirconium tetrapropoxide a nd arsenic acid under mild hydrothermal conditions and its structure w as solved from the X-ray powder diffraction data. The compound crystal lizes in the triclinic space group P (1) over bar with a=8.846(1), b=9 .393(1), c=5.5352(7) Angstrom, alpha=92.504(2), beta=91.353(3), gamma= 108.267(2)degrees and Z=1. The structure consists of two octahedrally coordinated zirconium atoms, one of which is bound only by arsenate ox ygens and the other by arsenate oxygens and water molecules. The bridg ing of zirconium atoms by arsenate oxygens creates a one-dimensional c hannel structure. The channels are filled with lattice water molecules that are hydrogen bonded to themselves as well as to the coordinated water molecule. (C) 1998 Elsevier Science B.V.